Readily dismountable reciprocating pump assembly



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May 25 T965 DTSMGIJNTA'B'LE RECIRROGATIN@ BUMP AS SEMBEY.

D`eGL. 1'2",i 1960? Y n NQ Nm.

INVENTGQ a N R e 0 @Mm y@ a Wu ha .m @m

' May 25, 1965 R. A, YQHPE 3,185,103

READILY DISMOUNTABLE RECIPROCATING PUMP ASSEMBLY Filed Dec. 12, 1960 3 Sheets-Sheet 3 BY 02U @CPM ATTORNEY United States Patent C) 3,185,i03 REABILY DiSMUNTABLE RE'CHRCATENG PUMP ASSEMBLY Reinhard A. Yohpe, Hattie Creek, Mich., assigner to Union Pump Company, Bettie lJreeh, Mich., a corrieration of ltlichigan Fiied Dec. 12, 196e, Ser. No. 75,3% 14 Ciaims. (Ci. 10S-153) The present invention relates broadly to pumping apparatus, and in its more specific phases to a special form of reciprocating pump adapted for handling liquid food materials.

Reciprocating pumps such as are used to pump liquids at high pressures for passage through various forms of equipment, such as homogenizers, have to be strong, substantially leak proof, have positive acting inlet and outlet valves, and where such equipment has to handle liquid foodstuffs, it has to be readily dismountable for cleaning and sterilization, and also easily reassemblable for reuse. High pressure pumps have long been made, but in general are not easily dismountable. In my U.S. Patent No. 2,655,870, granted October 20, 1953, I have set forth a special form of triplex reciprocating pump for handling liquid food materials. That machine is very efficient in handling food materials such as milk, but is relatively expensive to manufacture, and not as easily adjustable as desirable. My further work in this eld has shown the need of less costly high pressure pumping equipment which is much more simplied, yet positive acting, easy to dismantle, and yet readily reassemblable, and it was this recognition of the problems and needs in this eld which led to the conception and development of the present invention.

Accordingly among the objects of the present invention is the provision of an improved form of reciprocating pump especially ad-apted for handling liquid food materials, and yet which is very easy to quickly dismantle for cleaning and sterilization, and very easy to quickly reassemble ready for reuse once more.

Another object is to provide a pump cylinder assembly adapted for pumping liquids under high pressure, such as are required for homogenizing practices, and other applications, and wherein the parts of `same can be readily taken apart for cleaning and sterlilization, and readily reassembled ready for use once more.

Another object is to provide a pump cylinder assembly wherein each cylinder has a removable sleeve having one closed end and in which sleeve the pump plunger operates While pumping.y

Another object is to provide a pump cylinder assembly having a removable sleeve with a closed end, and wherein Ithere is an anchoring means at each end of said sleeve for holding same in predetermined operating position.

Another object of this invention is to provide a pump cylinder assembly having a removable sleeve with a closed end, and which sleeve is counterbored at its open end for the reception of a pair of ring sleeves of a little smaller inside diameter than that of said closed end sleeve, and wherein said ring sleeves have a plunger seal between them, and wherein either fixed or adjustable means may be used to hold said ring sleeves and plunger seal in operable sealing relation with a reciprocating plunger operable therethrough.

Another object of the present invention is to provide the cylinder block with a stepped bore for the reception of a removable closed end sleeve, and wherein said sleeve is provided on its outer f-ace with 0 rings adjacent each end portion of same within said cylinder block for sealing said closed end sleeve in said cylinder block with said O rings being adjacent said steps so that when said rice sleeve is removed, closed end tirst, said O rings will move olf `from said steps and release their sealing pressure for ready removal of said sleeve from said cylinder block, the bore of said cylinder block at said steps being tapered, or chamfered, to facilitate both removal and reassembling the sleeve with its O rings in the cylinder block after cleaning and sterlilization has been completed.

Another object of the present invention is to provide a pump cylinder assembly having a removable closed end sleeve, and wherein there is an anchoring means at each end of said sleeve for holding same in predetermined operating position lin a cylinder block, and wherein the anchoring means at the closed end of said sleeve is also adapted, in preferred construction, to `operate as a sleeve puller when the assembly is to be taken apart for cleaning and sterilization.

A further object of the present invention is to provide a pump cylinder assembly wherein each cylinder has a removable closed end sleeve in which the pump plunger operates while pumping, said sleeve having inlet and outlet ports adjacent the closed end of same, the cylinder block having inlet and loutlet ports in direct communication with the corresponding ports of said sleeve, and with each of said communicating ports having inlet and outlet valves with said valves being normally springr held on their seats, said inlet valve spring having a cap enclosing its outer end and with said cap riding on the outer surface of said closed end sleeve, said cap and sleeve having tapered or rounded edge portions facilitating assembly and disassembly of the pump cylinder assembly.

Still further objects and advantages of the present invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, the invention, then, consists of the pumping means hereinafter fully described and patricularly pointed out in the claims, the annexed drawings, and the following description setting forth in detail certain means for carrying out the invention, such disclosed means illustrating, however, but several of various ways in which the principle of the invention may be used.

In the annexed drawings:

FIGURE 1 is a partially sectioned view of a triplex form of the improved high pressure pump of the present invention, with the valves shown in elevation, together with a diagrammatically shown homogenized valve attached to the outlet end of said pump.

FGURE 2 is a longitudinal sectional View through one of the cylinders of the present invention, with the plunger and valves shown in elevation, as seen on line 2-2 of FIGURE l, looking in the direction of the arrows.

.FEGURE 3 is a sectional view similar `to that of FIG- URE 2, but showing a modication.

The improved high pressure pump of the present invention will now be described, for convenience of explanation, in connection with its use in a machine in the form of a homogenizer. Homcgenizers are machines which are commonly used in the dairy industry for the treatment of milk, cream, and other food products, as well as with products such as salad dressings, ice cream mixes, and the iike. Here .periodic dismantling of the pumping members and the homogenizing members, for instance daily, is necessary to meet sanitary requirements involving both cleaning and sterilizing of the members which come in Contact with the food products.

Referring to the apparatus set forth more particularly in FGURES l and 2, it will be noted .that the high pressure pump generally indicated by the numeral 5 is in the form of a ltriplex pump which, in turn, has not only three piston and piston sleeve assemblies 6, but a common inlet passageway 7, and a common outlet passageway 8. The inlet passageway 7 is, of course, conventionally connected (not shown) to a suitable source of supply of the material to be pumped. On the other hand the outlet passageway 8 is conventionally connected to a discharge passageway 9, and such connection may, if desired, be by way of a homogenizing valve `10, FIGURE 1, which will be hereinafter described, although not a part of the presen-t invention.

The pump 5 has a cylinder block 11 with inlet passageway 7 and outlet passageway 8, and with piston and piston sleeve assemblies 6 (three in a triplex pump) mounted between them. Since the piston and piston sleeve assemblies and the connections to same from said main inlet and outlet passageways are all substantially alike, the description of one such combination will suffice for all of them. It is to be noted that in some cases it is desirable to cool the overall assembly, and if desired cooling fluid passageways or jacketing may be provided for cylinder block 11. However, since this conventional cooling is not part of the present invention, same has not been illustrated.

Again referring to FIGURES l and 2 it will be noted that each pumping unit fits into a cross bore 12 which is of a little smaller diameter at the plunger inlet end 12a than at its other end 12b for a purpose to be hereinafter set forth. The outer end of bore 12b is also provided with an outturned chamfered edge 13, and bore 12a is similarly chamfered at 14 on its end joined to bore 12b, all for a purpose t0 be hereinafter explained.

Substantially centered on the crosswise upper edge of cylinder block 11, and directly above each piston and piston sleeve assembly 6, the cylinder block is provided for each piston and piston assembly unit with a vertical bore 15 which extends through outlet passageway 8- and terminates in a seat le which is preferably provided with a chamfered or uniformly tapered face. From the inner edge of this chamfered face the bore 15 is continued in the smaller diameter portion 15a, with same continuing completely into cross bore 12 for the pumping unit. Coaxial with bore 15 and 15a and at the opposite side of the cross bore 12, an enlarged bore 17 is provided, and coaxial with same is a seat which is preferably provided with a chamfered or uniformly tapered face 15; Extending from the inner edge of said chamfered face 1S is a smaller diameter bore portion 17a which extends completely into inlet passageway 7, thus providing a continuous passageway from inlet passageway 7 to outlet passage way S subject to flow restrictive members which will be hereinafter described.

In the bore 17a there is mounted for endwise sliding operation an inlet valve 19 having a seat 20 fitting block seat 18 at the juncture between bores 17 and 17a. This valve is preferably provided with vanes 21, of which there are more than two and wherein four, as shown, are very satisfactory. These vanes 21 slide up and down in bore 17a as the valve 19 opens and closes and thus holds same in accurately alined position. The top of the valve is preferably provided with a substantially cylindrical boss 22 which is co-axial with the valve and of only slightly smaller diameter than the inside diameter of compression spring 23 which fits over same. Mounted on the upper end of compression spring 23 is a valve spring cap 24 which has a top member 25 and a downturned substantially cylindrical flange 26 which extends well below the top of boss 22 on the head of valve 19. The clearance between the top of boss 22, and the under face of top member 25 of the cap 24 is sucient to allow valve 19 to operate to the full extent of its required opening under pumping conditions, and the lower end of flange 26 also clears the top of valve 19 by an amount preferably the same as the clearance of boss 22 from the underside of valve spring cap top member 25. The flange 26 of valve spring cap 24, and the boss 22 of valve 19 are of a length such that they overlap for a substantial distance and flange 26 has an inner diameter just slightly larger than the outside diameter of compression spring 23 when same is Cil depressed. This compression spring, when fully released, is only a little bit longer than it is in operating position shown in FIGURES 1 and 2. This spring is of a compressive strength such that it will normally keep valve 19 tightly sealed except when there is a suction pressure drawing liquid in from the main inlet passageway 7 past valve 19. The upper edge of valve spring cap 24 is preferably provided with a chamfer or rounded surface 27 for ease of assembly, as will be hereinafter described. The top face of valve spring cap 24 engages the under face of removable pump sleeve 2S to provide a reaction point for stabilizing the operation of inlet valve 19. Stabilizing the inlet valve has been a problem which has caused considerable diiculty in the past and the present solution takes care of that problem in simple and adequate manner.

In the outlet bore 15a through which the pumped liquid passes to outlet passageway 3, by way of bore 15, there is mounted an outlet valve 29 which has a valve seat 3G which tightly fits block seat 16 in the upper end of vertical bore 15a. Valve 29 also has vanes 31 of which there are preferably more than two as shown. These vanes closely but slidably fit bore 15a to accurately guide outlet valve 29 in its endwise movements. This valve has a boss 32 on its upper end around which closely iits a compression spring 33. This compression spring is preferably of a moderate compression strength and serves to keep the valve properly seated at all times except when elevated for the passage of uid through bore 15 into main outlet passageway 8. Mounted over vertical bore 15 is a heavy section cap member 34 anchored firmly in place by means of studs 35, and nuts 36. The cylinder block 11 is provided with a small counterbore 37 concentric with vertical bore 15, and in which is placed a gasket such as an O ring 3S of a size such that when cap member 34 is tightened in place it forms a liquid tight seal. On the under side of cap member 34 is a boss 39 which preferably closely fits vertical bore 15, and preferably said boss is provided with an extension 4) against which the upper end of the outlet valve compression spring 33 rests.

At the outlet end of outlet passageway 8, FIGURE 1, is conventionally connected a homogenizer valve assembly 10, one form of which is illustrated and utilizes a seat member 41 fitting in counterbore 57 at the outlet end of main outlet passageway S which has a gasket 42 for sealing said passageway at seat member 41. This homogenizer seat member 41 has a longitudinal passageway 43 at the outer end of which is its outlet seat 44. Seat member 41 is pushed against gasket 42 by means of a hollow sleeve member 45 which is provided with a circumferential groove 46 and radial passageways 47 connecting the inside of said sleeve with said groove. Sleeve member 45 is provided with a bore 48 a major portion of its length for the slidable reception of a closely fitting cylindrical member 49, the end of which has a seat 50 which cooperates with seat 44 to provide the area through which the liquid to be homogenized is forced, and Where homogenizing takes place.

Sleeve member 45, FIGURE l, has its outer end portion 51 reduced in diameter to form an outward extending member with a bore 52 for a pressure applying member 53 and with bore 52 counterbored at 54 for the reception of a suitable gasket 55. Fitting over outer end portion 51 of sleeve member 45 is a compression spring assembly housing 56, the leading end of which is of reduced diameter so as to fit into the end of counterbore Y 57, with a suitable gasket 5S for tightly sealing the assembly in counterbore 57 when the compression spring assembly housing 56 is tightly drawn into place against the end of cylinder block 11 by conventional means (not shown). Compression spring assembly housing 56 is provided with a bore in which pressure applying member 53 slidably tits, and within that bore is a heavy section compression spring 59, the outer end of which rests on a push member 6G. The outer surface of the outer end of compression spring assembly housing 56 is provided with threads 61 and on which is threadedly engaged a nut 62 preferably provided with extending handles 63 for rotating nut 62 to apply pressure on compression spring 59 which in turn through pressure applying member 53 forces cylindrical member 49 so that its seat 5i) engages Seat 44 of homogenizer seat member 41 so that the tightness of nut 62 determines the homogenizing pressure exerted by the assembly. The homogenized liquid fiows out of the homogenizer valve 1t) through passageway 9 in outlet connecting member 64 which is conventionally sealed against cylinder block 11 with a gasket 65. This outlet connecting member is rigidly held in position on cylindrical block 11 by conventional means (not shown).

Referring to FIGURE l, it will be noted that the removable pump sleeve 28 has two inlet ports 66, and one outlet port 67. Also, that the spacer portion 63 between inlet ports 66 provides the support for the top member portion 25 of valve spring cap 24, the advantages of which have already been described.

Now turning to FIGURE 2, it will be noted that removable pump sleeve 28 has a bore 69, and that the left hand end of same, as seen in the noted view, has a closed head 70. Said sleeve 28 also is provided with small grooves 71 and 72, just inside the side walls of cylinder block 11 and in said grooves are O rings 73 and 74 which seal the cross bore 12 against leakage without interfering with the dismanteling of the assembly for cleaning and sterilizing and the reassembling of same for use once more.

The closed head 70, FIGURE 2, of pump sleeve 2d has a counterbored, closed end, socket 75 in its outer face which is suitably threaded for engagement with threaded stud 76 which passes through a passageway 77 in the head of cap 73 which is provided with a bore 79 slightly larger than the diameter of closed head 70 of pump sleeve 2d, and with said bore being of suitable depth to permit pulling pump sleeve 28 outward by tightening nut 8G until O rings 73 and 74 move down chamfers 13 and 14 in the course of disassembling the pump as will be hereinafter described. The closed head 7i) of sleeve 23 is provided on its outer end with a positioning boss 81, FIGURE l. Flange 82 of cap 7S is provided with a cut out portion 83 into the inner end of winch said positioning boss Sl lits. A stop pin S4 on cylinder block 11 its into the outer end of said cut out portion 83 with the last mentioned members holding sleeve 2t; against rotating out of position shown in FIGURE l.

The open end of sleeve 28, FIGURE 2, is slightly reduced in outer diameter and provided with a circumferential chamfer 85 followed by a threaded portion 86, and a circumferential end chamfer 87. Also the open end of sleeve 28 is provided with a counterbore 88y in which is fitted a ring 89, plunger seal or packing 9i), and a throat ring 91 which preferable extends a short distance beyond the end of sleeve 28. The inside diameter of ring 89, plunger seal 9i?, and throat ring 91 is preferably slightly less than the inside diameter of sleeve 28 so that the back and forth pumping movement of plunger 92 will be entirely guided by said rings and seal member which in turn will reduce pumping friction below that which would prevail if said piston was in contact with the bore 69 of sleeve 28 throughout the length of said plunger within said sleeve.

Plunger 92, FIGURE 2, is provided adjacent its threaded end 93 with a slightly reduced diameter portion with flattened opposite faces 162 for engagement with a wrench or the like for screwing threaded end 93 into a corresponding threaded socket 94- in reciprocating rod 95 which is operated by a suitable source of power (not shown). Threadedly engaging the threads Se on sleeve 2S is an internally threaded cap 96. This cap is bored for a sliding fit with pump plunger 92, counterbored to freely receive the outer end of throat ring 91 and further counterbored and threaded to threadedly engage the threaded end portion 86 of sleeve 28. To facilitate adjustment of plunger seal 90, a gap 97 is preferably left between the end of sleeve 2S and the end of the major counterbore of threaded cap 96. Where a non-adjustable lixed packing is used for this purpose, gap 97 may be omitted.

For ease of knowing the liquid pressure in outlet passageway 8 ahead of the homogenizing valve 16, FIGURE l, one of the cap members 34 may be made of modied construction 34a having a neck portion 34h with a passageway therethrough, which is not shown as it is not part of the present invention, and to which may be connected a conventional pressure indicating device such as a pressuregauge 98.

To disassemble the pump shown in FIGURE 2, cap 96 is first completely screwed off from the threaded end 86 of pump sleeve 28, which leaves the latter ready to be pulled out of cylinder block 11, preferably after disconnecting threaded end 93 of plunger 92. Nut S0 is then screwed down stud 76, which in turn pulls pump sleeve 28 to the left and slides O rings 73 and 74 along the surface of bore 12 of cylinder block 11 and onto chamfered edges 13 and 14 where the sealing pressure on the O rings is released and the pump sleeve 28 freed for easy removal along with cap 7S. So far as pump plunger 92 is concerned, this may be left in place, if desired, until sleeve 23 is removed, and then the plunger may be removed. However, an alternate procedure, as suggested above, would be to first loosen cap 96, and then in conventional manner unscrew the threaded end 93 of pump plunger 92 out of the threaded socket 94 in the end of reciprocating rod 9S, thus allowing pump plunger 92 to be removed along with pump sleeve 2S. With sleeve 2S and pump plunger 92 removed, valve spring cap 24, compression spring 23, and inlet valve 19 may be picked out through the open end of bore 12. Outlet valve 29 and its compression spring 33 may be lifted out after unscrewing nuts 36 and lifting off cap member 34.

The homogenizing assembly, which forms no part of the present invention, and which has been diagrammatically shown as part of FIGURE 1 for better understanding of an application of the present invention, would also be removed in conventional manner for cleaning and sterilizing along with the pump parts described above.

A preferred manner of reassembling the pump after the removed parts have been cleaned and sterilized, is to first return the inlet valve 19 to its seated position, and then mount compression spring 23 and valve -spring Vcap 24 in place thereon. Outlet valve 29 is then returned t-o its seat, compression spring 33 mounted thereon, and cap member 34 returned to place and tightened Iby means of nuts 36 on gasket 38, which may be in the form of an O ring. One Way of reassembling the pumping assembly in cylinder block 11 is `to insert the pump plunger 92 in pump sleeve 2S, substantially in the relationship shown in FIG- URE 2, with ring S9, plunger seal 9i), and throat ring 91 in place and with the threaded cap 96 slid forward onto the end yof reciprocating rod 95. The end of sleeve 28, having the end of pump plunger 92 projecting from same, is then threaded into the left hand end of borel2, FIG- URE 2, with O rings 73 and 74 in place in grooves 71 and 72 of the sleeve. End chamfer 87 on the leading end of sleeve 28 will, as the sleeve passes down bore 12, engage the chamfered or rounded edge 27 Vof valve spring cap 24 and depress the latter to place a mild compressive force on spring 23, and as the sleeve 28 passes further down bore 12, chamfer will pass over valve spring cap 24 and increase the compression on inlet valve compression spring 23, and when the largest diameter of sleeve 28 is over cap 24 this Vwill further depress spring 23, to its operating pressure. The simultaneous passage of G rings 73 and 75 in grooves 71 and 72 over chamfers 13 and 14 will .place final sealing pressure on these 0 rings. Sleeve 28 would be pushed slightly beyond its final pumping position, but with O ring 74 still in bore 12, and then threaded cap 96 would be screwed onto the threaded end 86 of sleeve 28 to its operating position. This, with xed adjustment constructions, would be until the cap 96 was tight against the end of sleeve 28, while with adjustable constructions, the tightening would be continued until the plunger seal or packing 90 would be suitably sealed on pump plunger 92 and with there still remaining a gap 97 between the end of sleeve 28 `and cap 96. With cap 78 in place nut 80 would then be tightened on threaded stud 76 to move Sleeve 28 to the left and draw cap 96 firmly against the side of cylinder block 11, and thus anchoring the plunger seal or packing in adjusted operating position. The threaded end 93 of pump plunger 92 would then be screwed into threaded socket 94 of reciprocating rod 95, thus fully assembling the pumping mechanism ready for operation.

Where there are additional like cylinders, they also would -be assembled and adjusted in similar manner. It should be noted, in connection with the assembly just described, that the cap 78, with stud 76, and nut 80 provides an exceptionally satisfactory apparatus for pullingr sleeve 28 `for cleaning purposes, and for tightening the sleeve in adjusted position `after same has been reassembled in -bore 12 of cylinder yblock 11, following cleaning and sterilization.

A similar construction is shown in FIGURE 3, with the exception that the closed head 70a is formed with a anged edge 99 which has an undercut portion 160 for the reception of the end of a suitable tool (not shown) for applying prying force to slide pump sleeve 28a to the lef-t when the pump is to be disassembled for cleaning and sterilizing. Flanged edge 99 of the closed head 70a is provided with a cut out portion 83a for a stop pin 84a which thus holds the removable pump sleeve 28a in xed position holding the inlet ports 66 and outlet port 67 in registry with the through passageway containing the inlet and outlet valves.

Since it is important that any of the pumped liquid which might get past the plunger seal or packing 90, in either of the above described constructions, be kept from reaching the power drive mechanism where it might injure same, a bale member 101, FIGURES 2 and 3, is provided. This baffle member 101 is mounted on reciprocating pump rod 95 and forms a liquid tight joint with same so as to stop flow of liquid `along rod 95 beyond this oint. p The assembly and disassembly of the modified apparatus of FIGURE 3 is the same as has lbeen described above in connection with the assembly of FIGURES 1 and 2 with 'the exception that cap 78 with the threaded parts cooperating therewith have been omitted.

Attention is invited to the possibility of making variations to the present invention within the spirit and scope of the invention as illustrated and described. Directional terms such as top, upper, vertical, underj overj downturned, left, et cetera, have been used to facilitate describing the invention in the position shown in the drawings, and are not to he considered as limiting the invention, since obviously the pump can be operated in other positions than the upright one with horizontal plungers as illustrated.

Other modes of applying the principle of my invention may be employed instead of those explained, change being made as regards the pump apparatus herein disclosed provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention: Y

l. In a pump having a cylinder block with a bore opening therethrough and having inlet and outlet ports extending laterally in said block from the sides of said bore, the combination therewith of a closed end pump sleeve within said bore and having an externally threaded portion at the opposite end thereof extending out of said cylinder block, said sleeve having a longitudinal bore extending from said closed end and out of the externally threaded opposite end of same, means at the closed end of said sleeve for pulling same endwise .and when tightened holding same fixed relative to the movement of 4the closed end portion of said sleeve further into said bore, saidopen end portion of said sleeve being counterbored, packing and packing compression sleeve means in said counterbore, an internally threaded cap threadedly engaging the external threads on the open end of said sleeve, said cap having an outer end means engaging the outer end of said compression sleeve means so that tightening said cap against said compression sleeve means will compress said packing, said cap also including means serving as an endwise movement stop in abutment with said block for said sleeve when said pulling means at the closed end of the latter is tightened with said cap in place on said sleeve, a plunger movable back and forth within said sleeve during pumping operation, said packing in said sleeve forming a seal with said plunger, inlet and outlet ports in said sleeve substantially at opposite sides of same and adjacent said closed end thereof, means holding said sleeve so that the inlet and outlet ports of same are alined with and in communication with said inlet and outlet ports of said cylinder block, inlet and outlet valves in said inlet and outlet ports of said cylinder block, and means for holding same in operable position.

2. In the pump set forth in claim 1, wherein said inlet port in said sleeve has a longitudinal rib dividing same and forming part of the outer surface of said sleeve, said inlet valve having an elongated coaxial boss on the head of same, a compression spring closely fitting said elongated boss, and a cap with a downtumed flange closely but freely fitting over said spring and overlapping said boss, the top portion of said cap being supported on the outside portion of said inlet port longitudinal rib with said compression spring being only under a little compression when the pump is assembled ready for operation, said downturned flange being of a length such that said valve will be free to move endwise under pumping operation.

3. In the pump set forth in claim 1, wherein said inlet port in said sleeve has a longitudinal rib dividing same and forming part of the outer surface of said sleeve, said inlet valve having an elongated coaxial boss on the head of same, a compression spring closely fitting said elongated boss, and a cap with a downturned flange closely but freely fitting over said spring and overlapping said boss, the top portion of said cap being supported on the outside portion of said inlet port longitudinal rib with said compression spring being only under a little cornpression when the pump is assembled ready for operation, said downturned flange being of a length such that said valve will be free to move endwise under pumping operation, the outer end of said pump sleeve adjacent said externally threaded portion thereoi` being chamfered and the outer edge of the top of said cap likewise being chamfered to facilitate moving said pump sleeve, open end first, through said cylinder block and over said chamfered edge cap with said inlet valve in place, and slightly compressed by said pump sleeve in assembled position.

4. In the pump set forth in claim l, wherein the means at the closed end of said sleeve for holding the latter fixed relative to movement of the closed-end-portion thereof into said bore is a puller cap and ange means, and wherein there is cooperating means on said cylinder block and said sleeve, at the closed end of the latter, for engaging with said flange means and releasably holding said sleeve in rotatably fixed position so that said inlet and outlet ports of said sleeve remain in iixed operaand said sleeve, at the closed end of the latter, for engaging with said flange means and releasably holding said sleeve in rotatably fixed position so that said inlet and outlet ports of said sleeve remain in fixed operative location, and wherein said fiange is part of a cap member into which the closed end of said telescopically fits, said cap member and closed end of said sleeve being connected by threaded means adapted, when disassembling the pump, to be tightened for pulling said sleeve outward, closed end first, after said internally threaded cap acting as a stop at the open end of said sleeve has been released, to thus start the withdrawal of said sleeve from said cylinder block.

6. In a pump having a cylinder block with a bore opening therethrough and having inlet and outlet ports extending laterally in said block from the sides of said bore, the combination therewith of a closed end pump sleeve within said bore, said sleeve having a longitudinal bore extending from said closed end and out of the opposite end of same, stop means at the closed end of said sleeve for holding same fixed relative to movement of the closedend-portion of said sleeve into said bore, means on said cylinder block and on said sleeve at the closed end of same engaging said stop means and holding said cylinder in fixed non-rotatable operating position, means at the open-end-portion of the said sleeve for anchoring said Vsleeve against endwise movement of the open-end-portion of said sleeve into said bore, a plunger movable back and forth within said sleeve during pumping operation, packing means for said plunger adjacent the open end of said sleeve, said packing means being within said sleeve and a little smaller in inside diameter than the bore of said sleeve where it acts'to both seal and guide said plunger in its back and forth pumping movements, said means at the open-end-portion of said sleeve for anchoring said sleeve against endwise movement also supporting the outer end of said packing means, inlet and outlet ports in said sleeve adjacent said closed end thereof and in communication with said inlet and outlet ports of said cyLinder block, and inlet and outlet valves in said inlet and outlet ports of said cylinder block.

7. In the pump set forth in claim 6, wherein said inlet port in said sleeve has a longitudinal rib dividing same and forming part of the outer surface of said sleeve, said inlet valve having an elongated coaxial boss on the head of same, a compression spring closely tting said elongated boss, with a downturned flange and a cap closely but freely fitting over said spring and overlapping said boss, the top portion of said cap being supported on the outside portion of said inlet port longitudinal rib with said compression spring being only under a little compression when the pump is assembled ready for operation, said downturned flange being of a length such that said valve will be free to move endwise under pumping operation.

8. In the pump set forth in claim 6, wherein said inlet port in said sleeve has a longitudinal rib dividing same and forming part of the outer surface of said sleeve, said inlet valve having an elongated coaxial boss on the head of same, a compression spring closely fitting said elongated boss, and a cap with a downturned flange closely but freely fitting over said spring and overlapping said boss, the top portion of said cap being supported on the outside portion of said inlet port longitudinal rib with said compression spring being only under a little compression when the pump is assembled ready for operation, said downturned fiange being of a length such that said valve will be free to move endwise under pumping operation, the open end portion of said sleeve projecting from said block being externally threaded, the outer end of said pump sleeve adjacent said threads being chamfered, and the outer edge of the top of said cap likewise being chamfered to facilitate moving said pump sleeve, open end first, through said cylinder block and over said chamfered edge cap with said inlet valve in place, and slightly cornpressed by said pump sleeve in assembled position.

9. In the pump set forth in claim 6, wherein the stop means at the closed end of said sleeve for holding the latter fixed relative to movement of the closed-end-portion thereof into said bore is a iiange means, and wherein said means on said cylinder block and said sleeve at the closed end of the latter, for releasably holding said sleeve in rotatably fixed position so that said inlet and outlet ports of said sleeve remain in fixed operative location is in the form of pins in said sleeve and block while said fiange has a recess in same for receiving said pins.

l0. In the pump set forth in claim 6, wherein the stop means at the closed end of said sleeve for holding the latter fixed relative to movement of the closed-end-portion thereof into said bore is a liange means, and wherein said means on said cylinder block and said sleeve, at the closed end of the latter, for releasably holding said sleeve in rotatably fixed position so that said inlet and outlet ports of said sleeve remain in fixed operative location is in the form of pins in said sleeve and block while said flange has a recess in same for receiving said pins, and wherein said flange is part of a cap member into which the closed end of said sleeve telescopically fits, said cap member and closed end of said sleeve being connected by a threaded means adapted, when disassembling the pump, to be tightened for pulling said sleeve outward, closed end first, after-said internally threaded cap acting as a stop at the open end of said sleeve has been released, to thus start the withdrawal of said sleeve from said cylinder block.

11. In a pump having a cylinder block with a removable closed end sleeve therein for a plunger, said sleeve having inlet and outlet ports in the side of same adjacent said closed end thereof with said ports in said sleeve communicating directly and in line with inlet and outlet ports in said cylinder block, the combination therewith of an endwise movable inlet valve wholly within said inlet port of said cylinder block, said inlet valve having a coaxial support means on the top of same, a compression spring closely but freely fitting said coaxial support means, a valve spring cap having a flange which closely but freely fits over the outside of said compression spring, the top of said cap having the edge portion of same angled toward said inlet valve to provide for the easy sliding of said sleeve over said valve spring cap top in the assembling of said pump after said inlet valve has been mounted in its operating position, a longitudinal rib means in the surface of said sleeve lengthwise of said inlet port, the top of said valve spring cap resting against the side of said longitudinal rib means of said sleeve, after said pump has been assembled, to supply mild compression pressure on said inlet valve to normally hold same closed except when same is opened by pumping suction.

12. A pump having a cylinder block with a bore opening therethrough and having inlet and outlet ports extending laterally in said block from the sides of said bore, and having inlet and outlet valves operably fitting said inlet and outlet ports, the combination therewith comprising a closed end pump sleeve within said bore, said sleeve having a longitudinal bore extending from said closed end and out of the opposite end of same, said pump sleeve having a pair of small circumferential grooves in same near but spaced a short distance from the sides of said cylinder block when said sleeve is in operating position therein, and an O ring in each of said small circumferential grooves tightly sealing said sleeve to said cylinder block in said bore, said cylinder block from the side of same adjacent the closed end of said sleeve to a point near but spaced from the I0 ring contact point at the opposite end 0f said bore being of a substantially uniform bore diameter, an outwardly flared chamfer at the first end of said bore and an inwardly contracted chamfer at said opposite end of said uniform diameter bore, With the cylinder block bore then continuing of a little smaller uniform diameter to the second side of said cylinder block with said second -O ring bearing against this smaller uniform l l diameter portion of the cylinder block bore adjacent said chamfer, said pump sleeve being of an outside diameter closely iitting said large and small diameter portions of said cylinder block bore While leaving suiiicient clearance for the endwise adjustment of said pump sleeve in said cylinder bore.

13. In a pump having a cylinder block with a bore opening therethrough and having inlet and outlet ports extending laterally in said block from the opposite sides of said bore, the combination therewith of a closed end pump sleeve Within said bore, said sleeve having a longitudinal bore extending from said closed end and out of the opposite end of same, said pump sleeve having a pair of small grooves in same near but spaced a short distance from the sides of said cylinder block when said sleeve is in operating position therein, an -0 ring in each of said small grooves tightly sealing said sleeve to said cylinder block in said bore, said cylinder block from the side of same adjacent the closed end of said sleeve to a point near but spaced from the IO ring contact point at the opposite end of said bore being of a substantially uniform bore diameter, an outwardly flared chamfer at the first end of said bore and an inwardly contracted chamfer adjacent but spaced from the opposite end of said bore, with the cylinder block bore then continuing of a little smaller diameter to the second side of said cylinder block With said second O ring bearing against this smaller diameter portion of the cylinder block bore adjacent said chamfer, said pump sleeve being of an outside diameter closely fitting said large and small diameter portions of said cylinder block bore while leaving suicient clearance for the end- Wise adjustment of said pump sleeve in said cylinder bore, means at the closed end of said sleeve for holding same iixed relative to movement of the closed-end-portion of said sleeve into said bore, stop means for holding the open-end-portion of said sleeve xed relative to movement of said sleeve open-endportion into said bore when said stop means is in operating position, means at the closed end of said sleeve for holding said sleeve in rotatably xed position when in pumping position, a plunger movable back and forth within said sleeve during pumping operation, packing means for said plunger adjacent the open end of said sleeve, said packing means being within said sleeve and a little smaller in inside diameter than the bore of said sleeve where it acts to both seal and guide said plunger in its back and forth pumping movements, said stop means for the open-end-portion of said sleeve also supporting the outer end of said packing means, inlet and outlet ports in said sleeve adjacent said closed end thereof and in direct communication with said inlet and outlet ports of said cylinder block, inlet and outlet valves in said inlet and outlet ports of said cylinder block, resilient means normally holding said valves on their seats, and means on the face of said cylinder sleeve extending into the inlet port of same to support the resilient means normally holding said inlet valve on its seat.

14. In a pump as set forth in claim 13, wherein the means at the closed end of said sleeve for holding the latter fixed relative to movement of the closed-end-portion thereof into said bore is a flange means, and wherein there is cooperating means in the form of pins on said cylinder block and said sleeve at the closed end of the latter and said flange has a recess in same for receiving said pins, for releasably holding said sleeve in rotatably fixed position so that said inlet and outlet ports of said sleeve remain in xed operative location.

References Cited by the Examiner UNITED STATES PATENTS 1,737,270 11/29 Sargent 309-3 1,940,677 12/33 Dymock 103-216 2,094,254 9/37 Brubaker 309-3 2,289,401 7/42 Yost 10S-216 2,655,870 10/53 Yohpe 103-216 2,732,805 1/56 Lucien 103-173 2,832,291 4/58 Gorsko 103-228 2,901,981 9/59 Wakeman 103-216 3,039,400 6/62 Trent 103-216 FOREIGN PATENTS 247,686 2/ 26 Great Britain.

VJOSEPH H. BRANsoN, JR., Primary Examiner.

LAURENCE V. EFNER, Examiner. 

1. IN A PUMP HAVING A CYLINDER BLOCK WITH A BORE OPENING THERETHROUGH AND HAVING INLET AND OUTLET PORTS EXTENDING LATERALLY IN SAID BLOCK FROM THE SIDES OF SAID BORE, THE COMBINATION THEREWITH OF A CLOSED END PUMP SLEEVE WITHIN SAID BORE AND HAVING AN EXTERNALLY THREADED PORTION AT THE OPPOSITE END THEREOF EXTENDING OUT OF SAID CYLINDER BLOCK, SAID SLEEVE HAVING A LONGITUDINAL BORE EXTENDING FROM SAID CLOSED END AND OUT OF THE EXTERNALLY THREADED OPPOSITE END OF SAME, MEANS AT THE CLOSED END OF SAID SLEEVE FOR PULLING SAME ENDWISE AND WHEN TIGHTENED HOLDING SAME FIXED RELATIVE TO THE MOVEMENT OF THE CLOSED END PORTION OF SAID SLEEVE FURTHER INTO SAID BORE, SAID OPEN END PORTION OF SAID SLEEVE BEING COUNTERBORED, PACKING AND PACKING COMPRESSION SLEEVE MEANS IN SAID COUNTERBORE, AN INTERNALLY THREADED CAP THREADEDLY ENGAGING THE EXTERNAL THREADS ON THE OPEN END OF SAID SLEEVE, SAID CAP HAVING AN OUTER END MEANS ENGAGING THE OUTER END OF SAID COMPRESSION SLEEVE MEANS SO THAT TIGHTENING SAID CAP AGAINST SAID COMPRESSION SLEEVE MEANS WILL COMPRESS SAID PACKING, SAID CAP ALSO INCLUDING MEANS SERVING AS AN ENDWISE MOVEMENT STOP IN ABUTMENT WITH SAID BLOCK FOR SAID SLEEVE WHEN SAID PULLING MEANS AT THE CLOSED END OF THE LATTER IS TIGHTENED WITH SAID CAP IN PLACE ON SAID SLEEVE A PLUNGER MOVABLE BACK AND FORTH WITHIN SAID SLEEVE DURING PUMPING OPERATION, SAID PACKING IN SAID SLEEVE FORMING A SEAL WITH SAID PLUNGER, INLET AND OUTLET PORTS IN SAID SLEEVE SUBSTANTIALLY AT OPPOSITE SIDES OF SAME AND ADJACENT SAID CLOSED END THEREOF, MEANS HOLDING SAID SLEEVE SO THAT THE INLET AND OUTLET PORTS OF SAME ARE ALINED WITH AND IN COMMUNICATION WITH SAID INLET AND OUTLET PORTS OF SAID CYLINDER BLOCK, INLET AND OUTLET VALVES IN SAID INLET AND OUTLET PORTS OF SAID CYLINDER BLOCK, AND MEANS FOR HOLDING SAME IN OPERABLE POSITION. 